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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c89871a49864881b6abca88f5a6ab2a4a8985956b3dcadfdf3fe4e1b46ea11' 
  AND token = 'pwoYUIUFT2eORt4LhsFiUaUvsNrS12zxQ3yFw7SqLRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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