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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c987ab744e086cdc9b965e060c99d47fb01fefc2a8fba555ce0730c72dd9989f' 
  AND token = '3nLN7iB0sk95HlVq9kIrMAteSePzsfFDanEi6tDC1RQ=' 
  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"
    }
  }
}