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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '745fd14471ec6d27b87e62e0aa656b0bddb7a7d2ee2033d23bf9ee297de90297' 
  AND token = 'k+ABTKHMJUro3rTTyU3Lx3A9KtS08oypd1biDXZhd0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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