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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5091c2f9f3a184f3170d08f33b1284c6b99c9e4d5af239032f17b4aac538118' 
  AND token = '2R/iuTgRHzRODcArHAtpj+pLgwlV6CR5iPWEMalPaXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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