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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2583b8e967ba1cb0134f20d8c6a9aa20a618602c06de407b79f4b96ebcbc052' 
  AND token = 'biYsJ2z1x8MF5GTpAR+AJhjOzMOWIDDZauuDk4qATCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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