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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '953a5d9640250a4f5e0302830cb6daa4b4a20bc1bdec90dad2077a3291f449e4' 
  AND token = 'b4/PbI05iG3ETJ5l2qQr1yh6Ix/Jz1kSExKcfQ+Ek4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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