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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df32dbd214d1684e6e459696a73c9879bb1e9c6fdc04964c75b50bd156a2fe8e' 
  AND token = 'c4nPPmQr90reBHBYP1XvrEBbqQCSfN+dXk6LDTsa3Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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