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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f13bd5c02e61a9ca2489ebdfbd9a2741b6e7d3fcbd14e3ad48a31862cb85c70' 
  AND token = 'ZWv8KLOKLtvVXn+DYjSciHMPsuymL6b5niKDne2+ICg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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