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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08af2624a3d3fdfe5af0ed838f9189f4ffe45698b1942c6095cc5fa0531a3ce' 
  AND token = 'O0M4Rvgs8QCrQLKeD2qM58xoL8BgqBuaZpjmKLrd1Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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