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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adfa968242a9d4c087d21613e9e51bce983389e96580148c99eaafa86e8c13af' 
  AND token = 'p0qS9gB8EZaLf+GmOS74tcn70cCFP5k9KSF3KQGfDPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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