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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61cfe9c79f36ba89e2e153852557883af6b8038681966f880b799c63b6c14b3e' 
  AND token = 'eNVMcxm/QVCEvxtkpqNVl3dnEa0mk1u/zRnbFHAlldw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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