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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f63c68081ed2ad98f2915d27c4308924a2ed07dea834ca2c5e90b6f013045a6' 
  AND token = 'JgPj2+5eC8x+DQj29Bw5h4qDihoOEi0oPedzOemmkM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}