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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90939ec4c159600df3f603c8c6059a3bf65315f7fb29804adc9c05ab6a0ad245' 
  AND token = '7jiqxubCkwATnBV6pUg0daFqPyMeTWSNwG1/bqUuakU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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