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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e47d0722afba20ff5c4e5b9bb3b5490dda3331d81e88a327545e88d5ccd823' 
  AND token = 'VX0yNdI2jZrBvla2ojUlh/3aj3bj6c/TVCzTrOD63AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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