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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7f41a450b54359865abc4e92fb3cc9e2a9dd99d07dff5c5be33c3308fd3b962' 
  AND token = 'wja49DK3290O+HxGSNfyt06N+cbHc4LKYi3il/xvdCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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