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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ca2e912d98cd00af659140ecbd2c8b6940061e8a5526aa8aa580f8de607a6b1' 
  AND token = '2+ifNmgKhaEqlD3VdmCNlzmcRpMtMiZgQ5ukHH5k0+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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