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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4db10d657c91cb789538acbede658eeb1701538354142bf375b781a1c85985a2' 
  AND token = '/uLFG7I2F2v2tovlLMqDn9kI2DnPxiRlHGxra0t1UXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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