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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c5a3a7b46a0fee9e29e2b2fa76f70bdc3d24a338f2c7eb10c03de1414196db2' 
  AND token = 'Sxr1R9G8hQxHj0tWpe1V9ELilVrgpll6vvA2HioAjRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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