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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff1839905640fe4b0fdc93cbf7cfe4506e81e33f6a797b64eb350c4ea922a775' 
  AND token = 'PNOYnciegIFdRBb+MLjfDMxoO2tMwRWW4DTGbcPCKbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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