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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900c6c40e55d3faf85b34ca5b9acb1db90eec4f2c9e0f9e57f5a6e9b2520ff5f' 
  AND token = '6cgY8alOsqcyZ4+cFYBzdZoV5CQmLixwALNHScSe9CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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