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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1166a958e6f4392d1e5771a9c7f7689b08dc68ff9612d4e9a90dd41449d551e1' 
  AND token = 'eKAnw+cW/A6VuudXCGE0aHQK2c1AFuxeCILKU4FpT2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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