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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e89939c166b9fe03bc99d3c5f341be57f405ca1b67e3801c2ef9c60c889ac84' 
  AND token = 'GVNQ6h14yJJmiOxBck9KMhwphMNZaow2D/+bhQhi0vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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