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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5f4ef11282835e2416142f83e3e80c4a50b1a1b27617127309c69b5e4c16af' 
  AND token = 'GeIvUndayTo5bDHbDm0fD3cAWXLMC7rw1IjchiwCaSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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