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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47244bb657eeb9af5f96e2e7ba12be9d9e7a2b583e2b4eb6e5f4c34c4522f7cb' 
  AND token = 'BL+5NkoQHMTRe99L1S4k2soS6vT78xcG8DwtgmzqY4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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