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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e7901dd0d941f72a00e6a815fff4eb1dfe4c1bfcd2bee9537ab73c612498c1' 
  AND token = 'jVqF9nkvL2r2vcm6Dq0aObP/r0zao+9vSFwGcwprWmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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