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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca3d2838d560dcf0c7c5f739ad161595d3f2b1f90fd4c857c9535c0ebe97b21' 
  AND token = 'oosFZDan0PUcg0BbHyan+prHTQweHNLq7g46rjsuUH0=' 
  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"
    }
  }
}