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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56606873451ed1b26a2795e41428ab5ff4d123cdec30c590d77be3008db2b92' 
  AND token = 'rTW5A4eMGtMMTWln2BU83LgeEwVB+Yn5MqwxB0m+d+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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