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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eddddb62afc8aa4aaf0e433b25d2476263833e102b18601fc53926deabefb3f2' 
  AND token = '9ORIRMQ2hglyM4V4WB973Vq4eAACUa6tEs/jV3DllZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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