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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b795e7d5a381dbcea769ad3d200710b2dc05647a592af2502a551f0248036ff6' 
  AND token = 'Zcuwoj7bs4+SXKo9Oq0nPBQdq8BeAC6g9PpvPNGaGH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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