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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a04c4f7bfc0b1c9e9701027c7c3e9a8bbb7f609614b3589b3fc2a41b1ef4cc' 
  AND token = 'r8h7ml3dgTtwkENXmg2fWO2uH8VrcSeE+LwL9sRgy1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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