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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a0726e6ca6147021aa99a7c4fc13a905ca36a38276cdbb82226b6d96fae77b4' 
  AND token = 'NGp7z8bTJPP7pHucJOX9dVCgtMdq17s26hLy4nAk+Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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