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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f90ac005ff92476342f94b0eacdf958187465cad3b6887ef4f2dd2214b536052' 
  AND token = 'qCX0k3aoAAKYm4qf01vl+h3W5M+zpWkRwVjY0NqVNb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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