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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de1d8fb46ca7a431afca819c194b1c8d1cf0225d87266357e6f13e019c6f7e98' 
  AND token = 'gc5dFjFytS6LogSkbCWVHPHjrMcBTaSQjSbkdPQC/VA=' 
  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"
    }
  }
}