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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95ee90429870d6cab5466554f036de26a0eca11c5163a848c86271efe0fced15' 
  AND token = 'VT4k47sIpM9RKh3qG8YmpJvEin3YX2ZkWxpR8dctWS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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