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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c2541daa64ce6671175e1b1ae8b42814a52fe6d41f9cf56d55cfe5c52bd8556' 
  AND token = '7kL5CPJ2rr9HZN/CGq6CgWJyleB50dXkN6sx8TA/zrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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