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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c42ab51a6a3c550ccf71160b0793befb6bd18f1e7ada91fbe9a090ecc925217e' 
  AND token = '+8icUpNQ4VeSVC2pt4h2JpIVmW/HE96chsm/CLiLcjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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