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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a064dc767109b2c6e783f7ad8944c016f3729363c70cd147aeca3b1aa374851' 
  AND token = 'cVPRuipRf5dgDYa7iynczgl5FLxe4kPy8GmIIpYEb1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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