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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64e44d04ed1f517d968d7114e52694da225a65261c7c5e6e3e15a2efdd3fbbd5' 
  AND token = 'S5w/KNJ0L2FN1Qys3k4ZhTvSWvIAI3By31j9x/GiCX4=' 
  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"
    }
  }
}