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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac4a28a547d9bc8b85c3c38f42f6f7bc6f2e24243cd2c92518ced43a4ef4212' 
  AND token = 'kmL0CyQvLcIuKuFobD41LK468iXliqpBwmunWyF+ygM=' 
  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"
    }
  }
}