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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea23868aa3f354dce6736ce76cfb64cdcdf37c76b0036e31cf26e7a663e2d863' 
  AND token = 'DdvTLyfqHwtsn7dF4MMAAg32s3lh9ZEVbYdi5jlZwd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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