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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd5c069a2a732e0cf739be7bcde2d44f8ed3d0c51dc72ca840a3332d2ae8f39' 
  AND token = 'oEUwav27Ah1XNSdFjcD7xZ64OMycej0jGfg89ySiX9U=' 
  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"
    }
  }
}