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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b918cf859fee53dd4d14aff452b70566acd474bf95ba4ff5668c90806294ffe6' 
  AND token = 'PrsnKa43tctroPWy6Ow+7zl9+6VVNiZ+4BlB2002hoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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