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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3fe909d73f96dc2975d8b4f18d8ff0e5986a2b4f6e839b4e0b70313f631662b' 
  AND token = 'aWYBcnktYoyDh1LlXcCesfx7eXGFyF1nuAleX2WpMlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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