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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3abc51748e539b3eff97c7eee1503f36459634bc75d2e2df0af6de97cca7a5d1' 
  AND token = 'zJaX/8dSK0P0NnnN/A9QlNLtVZnTvwX8Qkzar5G19uw=' 
  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"
    }
  }
}