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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25de51f650b13f1aa70bf5dacc4c5df742a8c8d5ead34271290b0fd922b97ced' 
  AND token = 'zIoSEZfsXzu1b84KorATVA+tNZL13Q8Q1InOeazDcFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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